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warning retailers to be on high alert. it turns out the hackers who used malicious software to steal data from millions of target customers may be using that very same software at other stores across the country. now there are reports that these hackers may be tied to russian mobs. here's christine romans. >> a lot of what investigators know about the hack is being kept under wraps as cyberforensics experts sift through the clues. but what we do know is that homeland security is worried this isn't an isolated event. the u.s. government now warning retailers across the country to be on high alert, that massive attack on target over the holidays may have compromised the personal information of up to 110 million customers. it could be just the beginning. in a brand new bulletin, the department of homeland security now revealing that target may not have been alone, that the malicious software has potentially infected a large number of retail operations. and for the first time, they are

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